Carl recht



CARL RECHT, 0F `NEW YORK, N. Y.

Letters Patent No. 73,928, dated January 28, 1868.

IMPROVED MACHINE lfOlt THREADING SHEET-METAL PIPE( dlprlphnle referrer tu tu tigen @tetas uert mit mating anni nf tige 5mn.

rc ALL wHoM 1T MAY c oNcEnN:

Be it 'known that I, CARL RECHT, of the city, county, and State of New York, have invented a new and useful Machine for Threading Sheet-Metal Pipe;' and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, mnking part of this specification, and tothe letters marked thereon, in whichi Figurel is a plan or top view of my machine.

Figure 2 is a side view, part in section, of the same,

Figure'S is n. transverse section through the line a: z.

Figure 4 is a. longitudinal section through one ofthe corrugated ori-ribbed cylinders.

Figure 5 is a transverse section of the same.

Fgure' is a modification of g. 4.

Figure 7 is anend view ofthe same.

Figure Sis an yend view of the gauge-plate, showingi'n blue lines the manner in which the pipe ts against it.

The object of my invention is to construct a thread on the ends of sheet-metal pipes, so that they .may be screwed together in consecutive lengths. I

Myinvention'consists iupassing a stove or other sheet-metal pipe between two revolving corrugated or ribbed cylinders, these ribs or corrugations meshing into 'one another. As the cylinders revolve,lthey impress the .threads upon the pipe, the depth or pitch of the thread being regulated by a suitable gauge circumscribing one ofthe cylinders. i i i Descrzlptz'on of the Drawings.

A and B are the two revolving corrugated cylinders, meshing into one another, as shown, and made to operate by the lever C, and cogs D and E, the whole supported by a suitable frame, as shown. The cylinderA has a longitudinal channel or Agroove cut in it, (shown in section inl figs. 4, 5, and 6,) in which is secured. a movable strip, This strip or piece, z, is set back of the outside periphery of the cylinder A, a distance about equal lto the thickness of the seam on the sheet-metal pipe on which. the thread is to be turned, and is grooved or corrugated to match the cylinders, as showin. fis an eccentric rod or cam, working in a slot, which, when: the lever 6 is pushed in the direction indicated by the red arrow, forces the strip t Hush up to the same ribbed surface as' the cylinder A', and conversely, when the lever is .revolved in. an opposite direction, the strip la is made to fallback of the surface of the cylinder The-object of the channel and strip k is to receive' the vseam on the sheet-metal pipe, as will be more fully hereafter explained. F and Gr are friction-rollers, tb keep the pipein position while it is in between the rollers. I is a rest for holding'the pipe, which can be raisedor f lowered, as occasion may require. H is a. gauge-plate, nearly 'circumscribing the roller or cylinder Rand attached to the standards J and K by means of the rods 'R S. These rods are adjusted and secured by means oi' the thumb-screws M M. The gauge-plate H is so constructed that the part marked d projects beyond the part marked c a distance equal to the' pitch ot' the .thread on the pipe. The end of the sheet-metal pipe is eut on the same angle as the desiredv thread, so that at the seam where the ends of the vpipe are lapped or secured together, one end of the seam projects over just the depth of therpitch, or a distance equal to that between the parts c and d ofthe face ofthe gauge-plate H. *i l To turn a thread on the en d of a pipe, a lengt-h is placed on the rest I, and pushed between the cylinders A and B, and'uphgainst the gauge-plate H, so that the end is ilush therewith, as represented at fig. 8. At the 1' same tim care is taken to place the pipe in the positioun shown at iig. 3, that is, with the seamon the side fitting' into the channel J. The upper cylinder A is then iirnily clamped down by means of'the adjusting-screw-'Nr The crank O is then revolved in the direction indicatedhy. the arrow, (at first, however, the-crank is started a little in the opposite direction,') until the corrugated or ribbed 'cylinders have traversed the whole circumference ofthe sheet-metal pipe. 1 I

The strip or piece t remains sunken or set back from the periphery of the cylinder until the projecting lever @during the revolution of the cylinder A, comes in contact with a. projecting pin, a, fastened tothe frame of the machine, at which moment the lever b is carried around toward the centre of the cylinder A, thus raising the `strip L so as to correspond o1' be Hush withithe surface of said cylinder, through the actiom oi the cam-rodfi The groove'or channel Jis new lled, and passes over the other parts of the pipe, exerting its effect by impressing its ribs-into said pipe, the sam-e-asfthough therewere no channel there. v

It will'be seen that the turning ofthe thread is caused by the cylinders A and B`seizingand revolving the end 'of the pipe around thesurfaceof the gauge-plate H, the whole end of the pipe, as it were, travelling on an inclined plane, the rise of which is equal to the desired pitch of the thread. I

By taking off the gauge-plate H,'and securing the end ofthe pipeto the clutchI O, by means of the thumbscrew m, and clamping the end of the pipe between the corrugated cylinders A and B, then revolving,r the crunk C, a thread would also be turned on the end o t the pipe.; but'I prefer to use the gauge-plate H, asin practice I have found it more desirable. The diameter ofthe sheet-metal pipe is immaterial, so long as its circumference' is commensurable by, the periphery ofthe cylinder A.

The section, iig. 3, shows the pipe (in blue) on the lower cylinder, the effect of which, as the cylinders are arranged, would be to turn a female thread thereon. ABy putting the end, of the pipe ron the upper roller A,

with the seam just over the channel, then clamping,r the cylinders firmly down, andturning the orank C, a male --thread would be turned on said pipe. Orthe same thing could be done by putting'the roller A- in the place of the roller B ,and ez'c versa. 'v

This machine may be used for mak-ing eithera right-handed orileft-handed thread on any sheet-metal pipe.

`lflhus, in place of the gauge-plate H,put.another gauge-platejust the oppositeor reverse of it, that is, where the part d sets back ofthe parte. We would thus be enabled to turn an opposite thread from the previous one.'

It will be seen that the clutchis constructed with several projecting rims, g kj, upon which various sized pipes may be clamped, by securing theends oi' Saidpipes betneenone of these rims and the thumb-screw m,

`I do not wish to limit inyseli' to the'peculiar construction exhibited atiig. 4, where the strip L is raised or lowered'by the action of the cam-rodfor I am aware that many devices for producing the motion desired may be devised; for ius-tance, a wedge, g, as shown at igs..6 and 7,'sliding freely between the cylinder A and stri'p h, and dove-tailed to these parte, would raise or lower the strip h to any desired degree, and there may be other ways which might beemployed for producing thesame result.

What I deem as an invention peculiar to myself, is the grooved cylinder A, containing a strip, It, which sets back so as to receive'the rib, which is common to all sheet-metal piping, said strip being arranged so that, at the proper time, it assumes a position' flush with the outside of the corrugated cylinder.

Claims, I

What I claim, and desire to secure by Letters Patent, is-f 1. The combination of cam-roller f, or its equivalent, withthe movable or sliding strip z, or its equivalent, when 'arrangedjis specified, and used for the purpose setjforth. i Y

2. The'combination ofthe gauge-plate H with the cylinders A and B, substantially as set forth.-

-3. I claim the combination ofv the clutch O and set-screw with rest I, all constructed as described, .when used for the purpose set forth. I

CARL RECHT.

Witnesses s J. L. JAoKsoN, CHAS. EDWD Holm. 

